When extreme solar explosive phenomena (flares or so) occur, many solar energetic particles (SEPs) are occasionally generated. If a SEP event occurs with its maximum magnitude, the radiation dose is estimated to be 1Sv at a space station altitude, which gives serious damages for astronauts and artificial satellite electronics. Therefore, early prediction of SEPs is an important subject in the space disaster science. It is known that some particular radio bursts are emitted simultaneously with large SEP events. Since radio waves can propagate faster than SEPs, we have been trying to observe the particular bursts for the early predictions by the development of new radio observation systems.
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